#box1{
  width: 100px;
  height: 100px;
  background-image: url('vue.jpg');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

#box2{
  width: 200px;
  height: 200px;
  background-image: url('react.png');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

#box3{
  width: 300px;
  height: 300px;
  background-image: url('angular.jpg');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}